Bitmap sourceImg = new Bitmap("d:\\images\\a.bmp"); Bitmap destImg = new Bitmap(sourceImg.Width, sourceImg.Height); Rectangle dataRect = new Rectangle(0, 0, sourceImg.Width, sourceImg.Height); BitmapData sourceData = sourceImg.LockBits(dataRect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb); BitmapData destData = destImg.LockBits(dataRect, ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb); IntPtr sourcePtr = sourceData.Scan0; IntPtr destPtr = destData.Scan0; byte[] buffer = new byte[sourceData.Stride]; for (int row = 0; row < sourceImg.Height; row++) { System.Runtime.InteropServices.Marshal.Copy( sourcePtr, buffer, 0, sourceData.Stride); for (int i = 0; i < buffer.Length; i += 4) { buffer[i + 0] /= 2; buffer[i + 1] /= 2; buffer[i + 2] /= 2; } System.Runtime.InteropServices.Marshal.Copy( buffer, 0, destPtr, destData.Stride); sourcePtr = new IntPtr(sourcePtr.ToInt64() + sourceData.Stride); destPtr = new IntPtr(destPtr.ToInt64() + destData.Stride); } sourceImg.UnlockBits(sourceData); destImg.UnlockBits(destData);
destImg
destImg.Save(@"d:\images\MyNewBitmap.bmp")
var
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